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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,567
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look at the bottom of the heads.
Generally, if there is air injection or plugs for the air injection it's 78/79
No plugs or no holes for air injectors 80/83 small port
Remove the panel on either side of the fan and look for a casting date on the heads will also help
Realize that next year production starts in July
Bruce
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